Brown Dwarf Size Comparison (IMAGE) Carnegie Institution for Science Caption An illustration showing the relative sizes of brown dwarfs as compared to starts and gas giant planets, courtesy of Carnegie Institution for Science. Credit Carnegie Institution for Science. Usage Restrictions With credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.